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No. 239,141. Patented Ma' h 22,1881.

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UNITED STATES PATENT rricE- HORACE L. BROOKE, OF BALTIMORE, MARYLAND.

HOT-BLAST OVEN.

SPECIFICATION forming part of Letters Patent No. 239,141, dated March 22, 1881.

Application filed December 29, 1880. (No model.)

To all whom it may concern:

Be it known that I, HORACE L. BROOKE, of Baltimore city, State of Maryland, have invented certain new and useful Improvements in Hot-Blast Ovens; and I hereby declare the same to be fully, clearly, and exactly described as follows, reference being had to the accompanying drawings, in which- Figure 1 is a transverse vertical sectional view of an oven embodying my present invention, and Fig. 2 is a sectional view on lines X X of Fig. 1.

My invention relates to that class of apparatus used for heatin g a current of air for use as the blast of a furnace, charcoal-kiln, Bessemer converter, or other device requiring a blast of heated air; and it has for its object to provide an oven whereby a maximum temperature will be imparted to the blast at a minimum expenditure of fuel, and the warping or cracking of the air-pipes incident upon the use of the ordinary and well-known forms of ovens are obviated.

My invention consists in certain improve ments upon that for which Letters Patent were granted me August 17 1880, No. 231,265, which, being premised, renders unnecessary in this instrument any detailed description of features which the two devices embody in com mon. For the same reason they are not shown in the drawings hereto annexed.

In the drawings, A is the oven, constructed of suitable masonry, and having its end and partition-walls a lined with fire-brick. In the partition-walls, and at opposite ends of the same, are openings B B, and O is the combustion-chamber, leading, by means of a number of openings, 0, into the flue-chamber above.

D D are the transverse mains, having deflecting-plates e e, as shown, and from these mains depend the flues E E, which are connected at their lower ends by transverse lower mains, F, havingdeflecting-plates f. Arches t i are sprung across the flue-chambers at intervals between the rows of pipes, so-as to direct the heated gases upon them, instead of allowing them, as heretofore, to play up between the rows.

H H are baffle-walls at the sides of the flameopenings 0, which prevent the flame from impinging upon the lower mains, F.

In operation the flames and heat take the course indicated by the large arrows up through the first flue-chamber, down the next, up the third, and so on through the series, if there be more than three. The. air-blast is led in at (1, passes down the pipes E, up the pipes E, and finally finds exit at d. Important ends are thereby attained. Of course the most intense heat is in the first flue-chamber, where the blast is already highly heated, owing to its passage through the other chambers, and the pipes are not subjected to the immense molecular strain which would be, and heretofore has been, caused by great difference in temperature between the externaland internal. surfaces of the pipes. This comparative equalization of temperature is, of course, seen in each of the chambers of the series; and as a natural and necessary result the maximum heating effect is secured from the combustion ofa given quantity of fuel. over, tend to expand uniformly longitudinally, and below the lower mains, which are suspended to the pipes, there is a space left equal tothe full expansion of the pipes, and here the mains meet with a foundation of brickwork, so as to prevent any elongation of the pipes beyond the natural expansion.

The salient features, it will be seen, consis in leading the heated gases and blast in opposite directions through the oven, and in directing the heated gases upon, or in close proximity to, the pipes by the walls t" 2', located between the rows.

What I claim is 1. In a hot-blast oven, a series of communicating flue-chambers having flues depending from upper mains, and connected at theirlower ends by transverse mains, and adapted, as described, to deliver a current of air in the opposite direction to the current of flames and products of combustion, as set forth.

2. In combination with the'flnechamlhers, communicating by means of openings located in opposite ends of the said chambers, the lines E E and transverse mains at both ends of the flues, adapted to deliver the blast alternately up and down throughout the series, as set forth.

8. In combination with the oven having perforated partition-walls a, the mains D F, hav- The pipes, inoreing partitions e e f, and the fines E E, as set verse supporting-mains D, having inlet and 10 forth. outlet 01 d, flues E E, and mains F, all ar- 4. A hot-blast oven having a series of deranged and operating substantially as dependingflues, and provided with walls or arches scribed.

5 a", for directing the heated gases upon or contiguous to the flues, as set forth.

5. In combination with the oven A, having Witnesses: partition-walls a, perforated at alternate ends, R. D. WILLIAMS, as described, and the fire-chamber O, the trans- J O. GITTINGER.

HORACE L. BROOKE. 

